Adjustable hacksaw-frame.



N0 637,462. Patented NOV. 21, I899. F. C. HAWKES. Y

ADJUSTABLE HACKSAW FRAME.

(Application filed May 26, 1899.

(No Model.)

NITED STATES ATENT OFFICE.

FRED O. HAWKES, OF SPRINGFIELD, MASSACHUSETTS.

ADJUSTABLE HACKSAW-FRAM E.

SPECIFICATION forming part 6f Letters Patent N0. 637,462, dated November 21, 1899. Application filed May 26, 1899. Serial No. 718,336- (No model.)

To aZZ whom it may concern.-

Beit known that I, FRED O. HAWKES, a citizen of the United States of America, residing at Springfield, in the county of Hampden and State of Massachusetts,have in vented new and useful Improvementsin Adjustable Hacksaw- Frames, of which the following is a specification.

This invention relates to hacksaws; and

the object thereof is the construction of the frame of a saw of this class in a manner which shall make it easily adjustable to saws of varying lengths; and the invention consists in the construction of a hacksaw-frameconsisting of two bars which are substantially identical, each having a deflected end and notches along its inner edge, combined with a pin near the outer end of the straight portion of each bar, so placed and formed that each pin engages one of the notches on the other bar when the bars are placed side by side in order to hold the bars in close contact with each other, and tubular transverse members which are fastened to the deflected ends of the bars, a handle having -a spindle and saw-engaging means passing through one such member, and a sliding post having means for engaging the saw passing through the tubular member, as will be more fully described hereinafter.

In the drawings forming part of this specification, Figure 1. shows a hacksaw-frame in side elevation embodying this invention. Fig. 2 is a perspective view of a saw-frame, showing the two parts thereof in separated relation. Fig. 3 is a vertical section taken through the frame.

Referring to the drawings, 2 represents one part of a saw-frame made according to this invention, and 3 represents the other part. These frame parts are constructed, as shown, substantially identical in form, and consist of the back portions 4 4 and the downhanging end portions 5, made of flat metal, as usual. The extremity 5 of the part 2 has riveted thereto the tubular member 6 for-the recep tion of the sliding post 7, which is threaded on the outer end thereof for the reception of a thumb-nut which abuts against the end of the said member 6, whereby said post may be moved endwise in the said member. On the inner end of said post 7 a pin 8 is provided for attaching one end of a saw 8 thereto. Said tubular member 6 is slotted on quarters, as usual, as indicated by 9, and a pin in the side of the post enters one of said slots for preventing the rotation of the post and its attached saw when in use.

On the end 5 of the part 3 of the saw-frame is a tubular member 10, similar to the member 6, and Whose outer extremity is slotted on quarters like the inner end of the member 6 and registering therewith. This is a feature, however, common to saws of this class and forms no part of-the invention.

The handle 12 has a fixed post 13 therein, over which the tubular member '10 slides, and a pin in said post located close up to the end of the handle engages one of the quarterslots in the member 10 to prevent the rotation of the frame part 3. On the end of the post 13 is a pin similar to the pin 8, whereby the other end of the saw may be attached to the end of said post 13.

Means for increasing or diminishing the distance between the points of attachment of the saw to the ends of the movable post 7 and the fixed post 13 are provided by making a series of short slots or notches 14 in the inner edge of the back portions 4 of the two parts 2 and 3 of the saw-frame, located at equal distances apart on each of said frame members and on each of the latter by providing a pin 15, projecting at right angles from the side of said back portions 4 of both frame parts from the contiguous sides of the latter as they are brought together in operative relation one to the other. The said pins 15 are preferably made with the ends thereof upturned, as shown in the drawings, in such manner as will permit the parts 2 and 3 to lie between said upturned end of the pins and the side of the frame parts on which it is located. This particular form of the pins 15 is not'essential, however, and any other suitable shape may be employed in lieu thereof having a portion to lap the outer side of the other frame-bar to prevent the separation laterally of the saw-frame parts 2 and 3. Such a construction, for instance, as is shown in Fig. 3 will serve as well as the pins 15.

It is of course obvious that when one of the pins 15 and one of the slots 14 are in operative engagement at one end of the frame the ICO other pin should register with the corresponding slot at the other end of the frame, and as these slots are uniformly spaced on each of the frame parts the interengagement of the pin on each of the frame parts with the slots on the other is assured whatever may be the degree of separation lengthwise of the said parts.

From the above description it is seen that a very simple and strong saw-frame may be made according to the construction described herein and one in which the adjustments to saws of various lengths may be made with great rapidity.

As it is impossible to separate the back portions of the saw-frame when once they have been engaged, as shown in Fig. 1, unless they are moved one relative to the other to a position diagonal to each other, substantially as shown in Fig. 2, it is apparent that as long as the saw 8 is attached to the posts 7 and 13 and a certain tension is maintained on said saw lengthwise by means of the thumb-nut shown on the post 7 or some similar contrivance the said back portions will remain in interlocked position and the greater the tension put upon the saw endwise the more securely will said portions be interlocked.

My construction of substantially identical bars 2 3 not only saves in the cost of manufaeture,but the formation of the frame of such 1 bars avoids recesses or inclosure of one bar, which would cause lodging of dust in small particles and interfere with the ready separation from or adjustment of one bar on the other.

Having thus described my invention, what Iclaim, and desire to secure by Letters Patent of the United States, is

An extensible handsaw-frame, consisting of two substantially iden tieal bars having flat sides, straight portions and deflected ends, and notches along the inner edge, and a pin near the outer end of the straight portion of each bar so placed and formed that each pin engages one of the notches on the other bar when the bars are placed side by side and extends along the outer faee of the other bar to hold the bars in close contact with each other, and the two pins pressing the frame against the pull of the saw-blade, the deflected ends of the bars having transverse tubular members in combination with a handle having a spindle, and saw-engaging means passing through such member, and a sliding post having means for engaging the saw passing through. the other member, all substantially as shown and described.

FRED G. HAVVKES.

Witnesses:

K. I. CLEMONS, II. A. CHAPIN. 

